       <!DOCTYPE html>
       <html lang="en">
       <head>
           <meta charset="UTF-8">
           <meta name="viewport" content="width=device-width, initial-scale=1.0">
           <meta http-equiv="X-UA-Compatible" content="ie=edge">
           <title>Document</title>
           <style>
           p[class=one]{
            width: 100px;
            height: 100px;
            background: red;
            text-align:center;
           }
           </style>
       </head>
       <body>
           <p class="one">hello </p>
           <div></div>
       </body>
       </html> 